Prince William: 'I don't lie awake waiting to be king'

On the eve of the Queen's 90th birthday on Thursday, the next but one king - Prince William - has been speaking to the BBC about his grandmother, his interpretation of "royal duty" and recent criticisms that he is a somewhat "reluctant royal".

The prince also told the BBC's Royal Correspondent Nicholas Witchell about his own ambitions for the monarchy when he finally succeeds to the throne.